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Question
Most accepted theory for ascent of sap is
Most accepted theory for ascent of sap is
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Solution
The correct option is B Transpiration pull
Transpiration pull and cohesion theory (cohesion tension theory) was originally proposed by Dixon and Jolly (1894) and supported by Renner (1911 to 1915), Curtis and Clark (1951), Benner and Golston (1952) Kramer and Kozlowski (1960). The features on which the theory is based are:Water is lost from the surface of the mesophyll cells of the leaves. The water escapes as water vapour into the intercellular spaces and finally into the atmosphere through stomata. A kind of water potential gradient exists from the leaf to the root and creates a transpiration pull. The water molecules have a strong force of cohesion (a tendency to stick together). The force of cohesion is even more in narrow tubes such as xylem vessels.
Transpiration pull and cohesion theory (cohesion tension theory) was originally proposed by Dixon and Jolly (1894) and supported by Renner (1911 to 1915), Curtis and Clark (1951), Benner and Golston (1952) Kramer and Kozlowski (1960). The features on which the theory is based are:
Water is lost from the surface of the mesophyll cells of the leaves. The water escapes as water vapour into the intercellular spaces and finally into the atmosphere through stomata.
A kind of water potential gradient exists from the leaf to the root and creates a transpiration pull. The water molecules have a strong force of cohesion (a tendency to stick together). The force of cohesion is even more in narrow tubes such as xylem vessels.
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